Add solution to day 1

05- May/01- Average Salary Excluding the Minimum and Maximum Salary/01- Average Salary Excluding the Minimum and Maximum Salary (Ahmed Gamal).js

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+// Author: Ahmed Gamal
+
+/**
+ * @param {number[]} salary
+ * @return {number}
+ */
+
+var average = function(salary) {
+    let ans = 0;
+
+    // sort the array to get the minimum and maximum values in the first and last index, then loop through the array and add all values except the first and last values
+    salary.sort((a, b) => a - b).forEach((val, idx) => {
+        if(idx !== 0 && idx !== salary.length - 1) {
+            ans += val;
+        }
+    });
+
+    // divide the sum by the length of the array - 2 to get the average
+    ans /= salary.length - 2;
+
+    // return the average
+    return ans;
+};